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i would not put a champion plug in my mower, let alone my jeep. NGK is what i suggest for it. just personal preference though. Many people run and swear by champions.
and a bad 02 sensor could very well cause the issue sending a bad reading back to the CPU causing what i would guess is most likely a rich issue, which would account for your rough idle. the 4.0 is a great motor, but can be finicky at times with bad sensors.
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beat up rusted out k5
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